Jefferson never described any of the genuine words of Jesus as a dunghill.
If you will examine Jefferson's letter to John Adams (of Oct. 13, 1813), you
will see that Jefferson speaks of "extracting the pure principles which he
taught" and stripping off "the artificial vestments in which they have been
muffled by priests" and ending up with "the very words only of Jesus."
Then, he goes on to say,

"There will be found remaining the most sublime and benevolent code of
morals which has ever been offered to man. I have performed this operation
for my own use, by cutting verse by verse out of the printed book, and
arranging the matter which is evidently his, and which is as easily
distinguishable as diamonds in a dunghill."

Nothing can be more exactly and seriously true than what is there stated; that but a short time elapsed after the death of the great reformer of the Jewish religion, before his principles were departed from by those who professed to be his special servants, and perverted into an engine for enslaving mankind, and aggrandising their oppressors in Church and State; that the purest system of morals ever before preached to man, has been adulterated and sophisticated by artificial constructions, into a mere contrivance to filch wealth and power to themselves; that rational men not being able to swallow their impious heresies, in order to force them down their throats, they raise the hue and cry of infidelity, while themselves are the greatest obstacles to the advancement of the real doctrines of Jesus, and do in fact constitute the real Anti-Christ.

"The truth is that the greatest enemies to the doctrines of Jesus are those calling themselves the expositors of them, who have perverted them for the structure of a system of fancy absolutely incomprehensible, and without any foundation in his genuine words."

"Calvin's character of this supreme being seems chiefly copied from that of the Jews. But the reformation of these blasphemous attributes, and substitution of those more worthy, pure and sublime, seems to have been the chief object of Jesus in his discources to the Jews: and his doctrine of the Cosmogony of the world is very clearly laid down in the 3 first verses of the 1st. chapter of John, in these words, `{en arche en o logos, kai o logos en pros ton Theon kai Theos en o logos. `otos en en arche pros ton Theon. Panta de ayto egeneto, kai choris ayto egeneto ode en, o gegonen}. Which truly translated means `in the beginning God existed, and reason (or mind) was with God, and that mind was God. This was in the beginning with God. All things were created by it, and without it was made not one thing which was made'. Yet this text, so plainly declaring the doctrine of Jesus that the world was created by the supreme, intelligent being, has been perverted by modern Christians to build up a second person of their tritheism by a mistranslation of the word {logos}."

"That religion or the duty which we owe to our Creator, and the manner of discharging it, can be directed only by reason and conviction, not by force or violence; and, therefore, all men are equally entitled to the free exercise of religion, according to the dictates of conscience; and that it is the mutual duty of all to practice Christian forbearance, love, and charity towards each other."

"The bill for establishing religious freedom, the principles of which had, to a certain degree, been enacted before, I had drawn in all the latitude of reason & right. It still met with opposition; but, with some mutilations in the preamble, it was finally passed; and a singular proposition proved that it's protection of opinion was meant to be universal. Where the preamble declares that coercion is a departure from the plan of the holy author of our religion, an amendment was proposed, by inserting the word "Jesus Christ," so that it should read "a departure from the plan of Jesus Christ, the holy author of our religion." The insertion was rejected by a great majority, in proof that they meant to comprehend, within the mantle of it's protection, the Jew and the Gentile, the Christian and Mahometan, the Hindoo, and infidel of every denomination."

But as this would be no punishment or change of condition to slaves (me miserum!) let them be sent to other countries. By these means we should be freed from the wickedness of the latter, & the former would be living monuments of public vengeance.

DEAR SIR, -- While on a short visit lately to Monticello, I received from you a copy of your comparative view of Socrates & Jesus, and I avail myself of the first moment of leisure after my return to acknolege the pleasure had in the perusal of it, and the desire it excited to see you take up the subject on a more extensive scale. In consequence of some conversation with Dr. Rush, in the year 1798-99, I had promised some day to write him a letter giving him my view of the Christian system. I have reflected often on it since, & even sketched the outlines in my own mind. I should first take a general view of the moral doctrines of the most remarkable of the antient philosophers, of whose ethics we have sufficient information to make an estimate, say of Pythagoras, Epicurus, Epictetus, Socrates, Cicero, Seneca, Antoninus. I should do justice to the branches of morality they have treated well; but point out the importance of those in which they are deficient. should then take a view of the deism and ethics of the Jews, and show in what a degraded state they were, and the necessity they presented of a reformation. I should proceed to a view of the life, character, & doctrines of Jesus, who sensible of incorrectness of their ideas of the Deity, and of morality, endeavored to bring them to the principles of a pure deism, and juster notions of the attributes of God, to reform their moral doctrines to the standard of reason, justice & philanthropy, and to inculcate the belief of a future state. This view would purposely omit the question of his divinity, & even his inspiration. To do him justice, it would be necessary to remark the disadvantages his doctrines have to encounter, not having been committed to writing by himself, but by the most unlettered of men, by memory, long after they had heard them from him; when much was forgotten, much misunderstood, & presented in very paradoxical shapes. Yet such are the fragments remaining as to show a master workman, and that his system of morality was the most benevolent & sublime probably that has been ever taught, and consequently more perfect than those of any of the antient philosophers. His character & doctrines have received still greater injury from those who pretend to be his special disciples, and who have disfigured and sophisticated his actions & precepts, from views of personal interest, so as to induce the unthinking part of mankind to throw off the whole system in disgust, and to pass sentence as an impostor on the most innocent, the most benevolent, the most eloquent and sublime character that ever has been exhibited to man. This is the outline; but I have not the time, & still less the information which the subject needs. It will therefore rest with me in contemplation only. You are the person who of all others would do it best, and most promptly. You have all the materials at hand, and you put together with ease. I wish you could be induced to extend your late work to the whole subject. I have not heard particularly what is the state of your health; but as it has been equal to the journey to Philadelphia, perhaps it might encourage the curiosity you must feel to see for once this place, which nature has formed on a beautiful scale, and circumstances destine for a great one. As yet we are but a cluster of villages; we cannot offer you the learned society of Philadelphia; but you will have that of a few characters whom you esteem, & a bed & hearty welcome with one who will rejoice in every opportunity of testifying to you his high veneration & affectionate attachment. To Dr. Joseph Priestley, Washington, Apr. 9, 1803

DEAR SIR -- Since mine of Aug. 22. I have recieved your favors of Aug. 16. Sep. 2. 14. 15. and -- and Mrs. Adams's of Sep. 20. I now send you, according to your request a copy of the Syllabus. To fill up this skeleton with arteries, with veins, with nerves, muscles and flesh, is really beyond my time and information. Whoever could undertake it would find great aid in Enfield's judicious abridgment of Brucker's history of Philosophy, in which he has reduced 5. or 6. quarto vols. of 1000. pages each of Latin closely printed, to two moderate 8 vos. of English, open, type.

To compare the morals of the old, with those of the new testament, would require an attentive study of the former, a search thro' all it's books for it's precepts, and through all it's history for it's practices, and the principles they prove. Ascommentaries too on these, the philosophy of the Hebrews must be enquired into, their Mishna, their Gemara, Cabbala, Jezirah, Sohar, Cosri, and their Talmud must be examined and understood, in order to do them full justice. Brucker, it should seem, has gone deeply into these Repositories of their ethics, and Enfield, his epitomiser, concludes in these words:

`Ethics were so little studied among the Jews, that, in their whole compilation called the Talmud, there is only one treatise on moral subjects. Their books of Morals chiefly consisted in a minute enumeration of duties. From the law of Moses were deduced 613. precepts, which were divided into two classes, affirmative and negative, 248 in the former, and 365 in the latter. It may serve to give the reader some idea of the low state of moral philosophy among the Jews in the Middle age, to add, that of the 248. affirmative precepts, only 3. were considered as obligatory upon women; and that, in order to obtain salvation, it was judged sufficient to fulfill any one single law in the hour of death; the observance of the rest being deemed necessary, only to increase the felicity of the future life. What a wretched depravity of sentiment and manners must have prevailed before such corrupt maxims could have obtained credit! It is impossible to collect from these writings a consistent series of moral Doctrine.' Enfield, B. 4. chap. 3.

It was the reformation of this `wretched depravity' of morals which Jesus undertook. In extracting the pure principles which he taught, we should have to strip off the artificial vestments in which they have been muffled by priests, who have travestied them into various forms, as instruments of riches and power to them. We must dismiss the Platonists and Plotinists, the Stagyrites and Gamalielites, the Eclectics the Gnostics and Scholastics, their essences and emanations, their Logos and Demi-urgos, Aeons and Daemons male and female, with a long train of Etc. Etc. Etc. or, shall I say at once, of Nonsense. We must reduce our volume to the simple evangelists, select, even from them, the very words only of Jesus, paring off the Amphibologisms into which they have been led by forgetting often, or not understanding, what had fallen from him, by giving their own misconceptions as his dicta, and expressing unintelligibly for others what they had not understood themselves. There will be found remaining the most sublime and benevolent code of morals which has ever been offered to man. I have performed this operation for my own use, by cutting verse by verse out of the printed book, and arranging, the matter which is evidently his, andwhich is as easily distinguishable as diamonds in a dunghill. The result is an 8 vo. of 46. pages of pure and unsophisticated doctrines, such as were professed and acted on by the unlettered apostles, the Apostolic fathers, and the Christians of the 1st century. Their Platonising successors indeed, in after times, in order to legitimate the corruptions which they had incorporated into the doctrines of Jesus, found it necessary to disavow the primitive Christians, who had taken their principles from the mouth of Jesus himself, of his Apostles, and the Fathers cotemporary with them. They excommunicated their followers as heretics, branding them with the opprobrious name of Ebionites or Beggars. To John Adams, Monticello, Oct. 12, 1813,

"A more beautiful or precious morsel of ethics I have never seen; it is a document in proof that I am a real Christian, that is to say, a disciple of the doctrines of Jesus ... the great reformer of the vicious ethics and deism of the Jews." Thomas Jefferson to Charles Thomson, January 9, 1816

[My views on Christianity] are the result of a life of inquiry & reflection, and very different from that anti-Christian system imputed to me by those who know nothing of my opinions. To the corruptions of Christianity I am indeed opposed; but not to the genuine precepts of Jesus himself. I am a Christian, in the only sense he wished any one to be; sincerely attached to his doctrines, in preference to all others; ascribing to himself every human excellence; & believing he never claimed any other. Thomas Jefferson, To Dr. Benjamin Rush, Apr. 21, 1803